English verb conjugation
COULD TANGO

Regular verb: tango - tangoed - tangoed

Affirmation

Simple form	V-ing form
I could tango you could tango he could tango we could tango you could tango they could tango	I could be tangoing you could be tangoing he could be tangoing we could be tangoing you could be tangoing they could be tangoing
Perfect	V-ing perfect
I could have tangoed you could have tangoed he could have tangoed we could have tangoed you could have tangoed they could have tangoed	I could have been tangoing you could have been tangoing he could have been tangoing we could have been tangoing you could have been tangoing they could have been tangoing

Negation

Simple form	V-ing form
I could not tango you could not tango he could not tango we could not tango you could not tango they could not tango	I could not be tangoing you could not be tangoing he could not be tangoing we could not be tangoing you could not be tangoing they could not be tangoing
Perfect	V-ing perfect
I could not have tangoed you could not have tangoed he could not have tangoed we could not have tangoed you could not have tangoed they could not have tangoed	I could not have been tangoing you could not have been tangoing he could not have been tangoing we could not have been tangoing you could not have been tangoing they could not have been tangoing

Interrogative form

Simple form	V-ing form
could I tango? could you tango? could he tango? could we tango? could you tango? could they tango?	could I be tangoing? could you be tangoing? could he be tangoing? could we be tangoing? could you be tangoing? could they be tangoing?
Perfect	V-ing perfect
could I have tangoed? could you have tangoed? could he have tangoed? could we have tangoed? could you have tangoed? could they have tangoed?	could I have been tangoing? could you have been tangoing? could he have been tangoing? could we have been tangoing? could you have been tangoing? could they have been tangoing?

Interro-negative form

Simple form	V-ing form
could I not tango? could you not tango? could he not tango? could we not tango? could you not tango? could they not tango?	could I not be tangoing? could you not be tangoing? could he not be tangoing? could we not be tangoing? could you not be tangoing? could they not be tangoing?
Perfect	V-ing perfect
could I not have tangoed? could you not have tangoed? could he not have tangoed? could we not have tangoed? could you not have tangoed? could they not have tangoed?	could I not have been tangoing? could you not have been tangoing? could he not have been tangoing? could we not have been tangoing? could you not have been tangoing? could they not have been tangoing?